Piston.



' fairly tight, a second pin 0 the length PATENT OFFICE.

MARC BIRKIGT, OF BOIS-t'JOLOMBES, FRANCE.

PISTON. J

Specification of Letters Patent. Patented Spt. 19, 1916- Application filed January 4, 1916. Serial'No. 70,254.

T 0 all whom it may concern:

Be it known that I, MARC Bmmc'r, engineer, citizen of the Republic of Swltzerland, residing at Bois-Colombes, Department of Seine, France, have invented certain new and useful Improvements 1n P1stons, of which the following is a specification.

This invention relates to pistons, more particularly to .pistons used in explosion engines.

This invention has for its object to avoid the rotation of the piston rings.

The invention consists in providing a stop means in eachwof the grooves of the piston head which receive the packing rings, that is to say, at that point of the groove where it is desired that the joint of the piston ring should be, this stop element or means being parallel to the axis of the piston.

The invention further consists in other arrangements which will be more explicitly referred to hereinafter. I

In the accompanying drawing, Figure 1 is an axial section of a piston illustrating the invention applied thereto. Fig. 2 is a cross-section of the same on the line 2- -2 of Fig. 1. I v

The piston a illustrated has four grooves (4 0 a a each intended to receive a split ring 12 b b b, and the joints of alternate and are diametrically opposite. Two holes 0 holes have their axes parallel to the axis of the piston, and are diametrically opposite each other, relatively to the said axis. These holes are made at a distance from the axis, slightly greater than the radius of'the bottom of the grooves a a a a and start ing from the operative face of the pistoh, extend beyond the groove of which is the farthest .away from said operative face.

Into the hole 0 is fitted fairly tight a pin 0 which is made of a length approximately equal to the distance separating the bottom of the said hole 0 from the lower face of the third groove a and the said pin is driven in downto the bottom of the said hole. In the same hole a is then fitted also f which is made aproximately equal to the distance separating the upper face of the third-groove a from the lower face of the first groove a p and the said pin is driven in until Its lower end is flush with the upper of the first groove a.

the rings and c are provided in the body of the said piston a so that the said face of the third end of the hole a is closed by means of a plug 0 of such a length that its lower end does not project beyond the upper face Into the hole 0 is fitted in a similar way, a first pin 0 which is made of a length approximately equal to the distance separating the upper face of -the fourth groove a from the lower face of the second groove of, and the said pin is driven in, until its lower end is flush with the upper face of the said fourth groove.

The upper end of the hole a is then closed.

by means of a such alength t flush, when it is face of the second groove o The rlngs are then fitted into said grooves taking care that the pin in each groove should be between the joint of the corresponding ring. M By this construction the pins prevent the lug 0 forming a pin, of at its lower end should be put in place, with the upper groove. Finally, the upper rings from turning or rotating about the piston, and the immovability of the rings is thus insured very simply and without fear that a leakage could'take place through the holes 0 and c owing to wear.

Each of the split rings, moreover, has a complemental recess in its inner face at its opposite ends, WhlCh recesses, when the opposite ends of the ring are in contact, form I stop pin to extend therethrough.

Obviously the invention is not limited to .a slot of such dimensions as to allow. the

Having now particularly described the nature of my said invention and in what to be carried out,

manner the 'same is I declare that what I claim is 1. The combination of a piston head' I formed with a plurality of circumferential grooves and having passages extending from the acting face thereof to a point beyond the innermost groove and extending through the latter, each groove and provided with an aperture, said rings being so arranged that the apertures/thereof alternately register with said passages, and pins disposed in said passages to extend through the apertures of the rings of a packing ring arranged in i which register with their respective passages.

2. The combination of a piston head formed with a plurality of circumferential grooves, said head having passages'extending from the acting face thereof to a point beyond the innermost groove and intersecting said grooves, a split ring arranged in each groove, each of said rings having cornplemental recesses in its opposite ends to form a slot at the joint of said ends of the ring, the slots of said rings alternately registering With said passages, and a plurality of pins disposed in said passages, each. pin preventing rotation of its respective ring on. said head.

3. A piston having a plurality of grooves in its circumference and having a plurality of passages extending in parellelism with its axis from the acting face thereof to a point beyond the innerrnost groove and intersecting said grooves, a plurality of pins in said passages, a ring in each groove and my hand in presence of two subscribing Witnesses,

MARC BIRKIGT. WVitnesses:

CHAs. P. PRESSLY, PAUL PLUM. 

